WO2015107679A1

WO2015107679A1 - Rotating electric machine

Info

Publication number: WO2015107679A1
Application number: PCT/JP2014/050821
Authority: WO
Inventors: 雅樹堀井; 篤史坂上; 井上　正哉
Original assignee: 三菱電機株式会社
Priority date: 2014-01-17
Filing date: 2014-01-17
Publication date: 2015-07-23
Also published as: CN105917555B; US20160322876A1; EP3096441A1; EP3096441B1; EP3096441A4; US10164491B2; CN105917555A; JPWO2015107679A1; JP6132936B2

Abstract

This invention provides a compact, high-output rotating electric machine wherein the coil shape of a distributed-winding type stator winding is designed such that a liquid refrigerant easily flows in the circumferential direction of the coil ends, and the ability to cool the stator winding can be increased. Winding bodies are manufactured by winding a δ-shaped coil pattern twice in the diameter direction, with the δ-shaped coil pattern being formed by inserting conductor wires into a second slot, a first slot, the second slot, and a third slot, in that order, and alternately changing the insertion direction into the first slot, the second slot, and the third slot from the axial direction. Multiple linear sections inserted respectively into the first slot, the second slot, and the third slot are linked continuously by means of coil end sections, and a liquid refrigerant is supplied to coil ends formed by the coil end sections.

Description

Rotating electric machine

The present invention relates to a rotating electric machine such as an electric motor or a generator, and more particularly to cooling of a stator.

2. Description of the Related Art In recent years, small and high output has been demanded in rotating electrical machines such as electric motors and generators. In order to reduce the size of this type of rotating electrical machine, concentrated stator windings in which conductor wires are wound around the teeth of the stator core are used from the viewpoint of reducing the size of coil ends that do not generate effective magnetic flux. It was. However, there is a demand for a stator using a distributed winding structure stator winding that can suppress torque pulsation and increase output.
Furthermore, since the heat generation in the stator windings increases as the output increases, high cooling performance of the stator windings is required.

Here, with respect to the concentrated winding winding formed by winding the conductor wire around one tooth, the winding configured by winding the conductor wire in a slot separated by two or more slots is referred to as a distributed winding winding. . That is, the distributed winding is wound so that the conductor wire extending from one slot enters another slot across two or more consecutive teeth.

A conventional rotating electrical machine has a pair of slots separated by one magnetic pole pitch from one end side in the axial direction of a stator core by connecting the ends of a pair of linear portions with a turn portion to form a U-shape. Are inserted into each of them, and the ends of the conductor segments extending to the other axial end of the stator core are joined together to produce a distributed winding stator winding, and perpendicular to the coil end of the stator winding. A liquid refrigerant was supplied from above to cool the stator winding (see, for example, Patent Documents 1 and 2).

JP 2013-034330 A JP 2013-062963 A

In a conventional rotating electrical machine, a stator winding is formed using a conductor segment formed in a U shape by connecting the ends of a pair of linear portions with a turn portion. There is a problem that the liquid refrigerant is difficult to flow in the circumferential direction of the coil end, and the stator winding cannot be effectively cooled.

The present invention has been made in order to solve the above-mentioned problems, and devised the coil shape of the distributed winding stator winding to facilitate the flow of liquid refrigerant in the circumferential direction of the coil end, thereby cooling the stator winding. An object of the present invention is to obtain a small, high-output rotating electrical machine that can improve the performance.

A rotating electrical machine according to the present invention includes a housing, a rotor fixed to a shaft rotatably supported by the housing, and disposed in the housing, and an annular stator in which slots are arranged in the circumferential direction. A stator having a stator winding attached to the stator core and the stator core, the stator being held in the housing via an air gap between the rotor and the rotor, and the fixed A cooling mechanism that supplies liquid refrigerant to the coil end of the child winding to cool the stator winding. Each of the stator windings is formed by winding a continuous conductor wire that is insulated and has no connection portion, and is arranged at n-slot angular intervals (where n is a natural number of 2 or more) in the circumferential direction. A plurality of winding bodies are provided in one slot, the second slot, and the third slot and arranged at a pitch of one slot in the circumferential direction. In the winding body, the conductor wire is connected to the second slot, the first slot, the second slot, and the third slot in this order, and to the first slot, the second slot, and the third slot. A δ-shaped coil pattern formed by alternately changing the insertion direction from the axial direction is repeatedly wound in the radial direction m times (where m is a natural number of 1 or more). A plurality of linear portions inserted into each of the slot, the second slot, and the third slot are connected in series by a coil end portion, and the coil end is configured by the coil end portion, and the coil The liquid refrigerant supplied to the end flows through a gap between the coil end portions adjacent in the circumferential direction.

According to the present invention, the winding body is configured as a pattern in which a δ-shaped coil pattern is wound m times in the radial direction. Therefore, the bending radius at the coil end portion is reduced, and the increase in size of the coil end due to the lane change can be suppressed. In addition, the winding body becomes a distributed winding, which suppresses torque pulsation and increases output.

A winding body configured in a pattern in which a δ-shaped coil pattern is wound m times in the radial direction is arranged at a 1-slot pitch. Accordingly, a flow path group formed by a gap between coil end portions adjacent to each other in the circumferential direction and having a refrigerant flow path shifted to one side in the circumferential direction toward the outer side in the axial direction is arranged at a one-slot pitch in the circumferential direction. A flow path group formed by a gap between coil end portions adjacent to each other in the circumferential direction, the refrigerant flow paths shifting outward in the axial direction toward the other side in the circumferential direction and arranged at a one-slot pitch in the circumferential direction. , Mixed in the radial direction. As a result, the liquid refrigerant supplied to the coil end flows through the refrigerant flow path of one flow path group to the end face of the stator core, flows radially on the end face of the stator core, and the other flow path group. Since the refrigerant flow flows away from the end surface of the stator core, the liquid refrigerant flows in the radial direction while flowing in the circumferential direction of the coil end, and is supplied to the inside of the coil end, thereby improving the cooling performance of the coil end. It is done.

It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the principal part of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the stator applied to the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the iron core block which comprises the stator iron core applied to the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the coil | winding assembly which comprises the stator coil | winding of the stator applied to the rotary electric machine which concerns on Embodiment 1 of this invention. It is a perspective view which shows the coil | winding body which comprises the coil | winding assembly in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a front view which shows the winding body which comprises the coil | winding assembly in the rotary electric machine which concerns on Embodiment 1 of this invention. It is an end elevation which shows the winding body which comprises the coil | winding assembly in the rotary electric machine which concerns on Embodiment 1 of this invention. FIG. 5 is an end view of the main part of the rotating electrical machine according to the first embodiment of the present invention as viewed from the first coil end side in a state where three winding bodies share one slot and are attached to the stator core. In the rotating electrical machine according to Embodiment 1 of the present invention, FIG. 3 is a developed view of a state in which three winding bodies share one slot and are attached to a stator core as viewed from the first coil end side. It is the expanded view which looked at the winding body with which the stator iron core was mounted | worn from the radial direction outer side in the rotary electric machine which concerns on Embodiment 1 of this invention. It is a principal part enlarged view which shows the surroundings of the 1st coil end of the stator applied to the rotary electric machine which concerns on Embodiment 1 of this invention. It is a schematic diagram explaining the flow of the refrigerant | coolant in the 1st coil end of the stator applied to the rotary electric machine which concerns on Embodiment 1 of this invention. It is a principal part end elevation which shows the 1st coil end of the stator applied to the rotary electric machine which concerns on Embodiment 2 of this invention. It is principal part sectional drawing which shows the surroundings of the 1st coil end of the stator applied to the rotary electric machine which concerns on Embodiment 2 of this invention. It is a perspective view which shows the stator applied to the rotary electric machine which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 4 of this invention.

Hereinafter, preferred embodiments of a rotating electrical machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing essential parts of the rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. 4 is a perspective view showing a stator applied to the rotary electric machine according to FIG. 1, FIG. 4 is a perspective view showing an iron core block constituting the stator core applied to the rotary electric machine according to Embodiment 1 of the present invention, and FIG. FIG. 6 is a perspective view showing a winding assembly constituting a stator winding of a stator applied to the rotating electrical machine according to Embodiment 1 of the present invention, and FIG. 6 shows the winding in the rotating electrical machine according to Embodiment 1 of the present invention. 7 is a perspective view showing a winding body constituting the assembly, FIG. 7 is a front view showing the winding body constituting the winding assembly in the rotary electric machine according to Embodiment 1 of the invention, and FIG. 8 is an embodiment of the invention. 1 is a winding assembly of the rotating electrical machine according to FIG. 9 is an end view showing the winding body to be operated, and FIG. 9 shows a state where the three winding bodies share one slot and are attached to the stator core in the rotary electric machine according to Embodiment 1 of the present invention. FIG. 10 is a first end view of the rotating electrical machine according to the first embodiment of the present invention in which three winding bodies share one slot and are attached to the stator core. FIG. 11 is a development view as seen from the coil end side, FIG. 11 is a development view of the winding body mounted on the stator core in the rotary electric machine according to Embodiment 1 of the present invention as seen from the outside in the radial direction, and FIG. FIG. 13 is an enlarged view of a main part showing the vicinity of the first coil end of the stator applied to the rotating electrical machine according to the first embodiment of the present invention, and FIG. 13 shows the first of the stator applied to the rotating electrical machine according to the first embodiment of the present invention. In the schematic diagram explaining the flow of the refrigerant in one coil end That. In FIG. 10, the coil end portion is shown linearly for convenience.

1 and 2, a rotating electrical machine 100 is a housing having a cylindrical frame 2 and a front frame 3 and a rear frame 4 which are disposed at both axial ends of the frame 2 and form a space to be sealed together with the frame 2. 1, a stator 15 that is fixedly fitted to the frame 2, and a shaft 7 that is rotatably supported by a front frame 3 and a rear frame 4 via a bearing 5. And a cooling mechanism for supplying a liquid refrigerant to the first and second coil ends 20f and 20r of the stator winding 20 of the stator 15.

The frame 2 is manufactured by press-fitting and integrating an aluminum cylindrical inner frame 2b inside an iron cylindrical outer frame 2a. And the recessed groove formed in the outer peripheral surface of the inner frame 2b over the whole circumference is closed by the outer frame 2a, and the introduction flow path 30 is configured. A supply hole 31 is formed in the outer frame 2a so as to communicate the introduction flow path 30 and the outer side of the outer frame 2a. Further, the injection hole 32 has the hole direction as a radial direction and the refrigerant flow path 3.
The inner frame 2b is formed so as to communicate 0 and the inner side of the inner frame 2b. A plurality of injection holes 32 are arranged at a constant pitch in the circumferential direction on the radially outer side of the first coil end 20f and the second coil end 20r of the stator winding 20 described later. The supply pipe 33 connects the discharge port of the supply pump 34 and the supply hole 31, and the return pipe 35 connects the oil pan 36 attached to the lower side of the frame 2 and the suction port of the supply pump 34. The mechanism is configured.

The rotor 6 is mounted so as to pass through the annular rotor core 8, the shaft 7 that is press-fitted and fixed so as to pass through the axial center position of the rotor core 8, and the outer peripheral side of the rotor core 8. The eight permanent magnets 9, the first end plate 10 and the second end plate 11 which are press-fitted and fixed to the shaft 7 and arranged so as to be in contact with both end surfaces of the rotor core 8 in the axial direction; Is provided.

Next, the configuration of the stator 15 will be specifically described with reference to FIGS. 3 to 11.

As shown in FIG. 3, the stator 15 includes a stator iron core 16 and a stator winding 20 attached to the stator iron core 16. Here, for convenience of explanation, the number of poles of the rotor 6 is eight, the number of slots of the stator core 16 is 48, and the stator winding 20 is a three-phase winding. That is, the slots are formed in the stator core 16 at a ratio of two slots per phase per pole.

The core block 17 is obtained by dividing the annular stator core 16 into 48 equal parts in the circumferential direction. As shown in FIG. 4, the core block 17 is produced by laminating and integrating electromagnetic steel plates, and has a core back portion 17a having a circular arc cross section. And teeth 17b projecting radially inward from the inner peripheral wall surface of the core back portion 17a. Then, the stator core 16 is formed by aligning 48 core blocks 17 in the circumferential direction, integrating the circumferential direction side surfaces of the core back portion 17a with the teeth 17b facing inward in the radial direction, It is configured in an annular shape. Slots 18 constituted by iron core blocks 17 adjacent in the circumferential direction are arranged at an equiangular pitch in the circumferential direction so as to open to the inner circumferential side. The teeth 17b are formed in a tapered shape in which the circumferential width gradually decreases inward in the radial direction, and the cross section of the slot 18 is rectangular.

For example, the winding body 22 is formed by continuously forming a δ-shaped coil pattern on an edgewise winding of a conductor wire 19 having a rectangular cross section made of a continuous copper wire or an aluminum wire, which is insulated with enamel resin and has no connection portion. And then rolled twice. Specifically, as shown in FIGS. 6 to 8, the winding body 22 includes a first straight portion 22a, a first coil end portion 22e, a second straight portion 22b, a second coil end portion 22f, and a third Two δ-shaped coil patterns comprising a straight portion 22c, a third coil end portion 22g, and a fourth straight portion 22d are arranged in the length direction of the short side of the rectangular cross section of the conductor wire 19, and the fourth straight portion 22d and the fourth straight portion 22d A straight line portion 22a is connected by a crossover line 23. The connecting wire 23 constitutes a coil end portion, the winding start end portion of the conductor wire 19 constitutes a winding end 22h, and the winding end end portion constitutes a winding end 22i.

In this winding body 22, the first straight portion 22 a and the third straight portion 22 c have a gap d in the length direction of the short side of the rectangular cross section with the length direction of the long side of the rectangular cross section facing the circumferential direction. Four are arranged in one row. Further, the second straight portion 22b is spaced from the row of the first straight portion 22a and the third straight portion 22c by a six-slot angle interval on the circumferential side, and the length direction of the long side of the rectangular cross section is directed in the circumferential direction. Two are arranged with a gap 3d in the length direction of the short side of the rectangular cross section. Further, the fourth straight portion 22d is spaced apart from the row of the first straight portion 22a and the third straight portion 22c by a 6-slot angular interval on the other side in the circumferential direction, and the length direction of the long side of the rectangular cross section is directed in the circumferential direction. Two are arranged with a gap 3d in the length direction of the short side of the rectangular cross section. The 6-slot angular interval is an interval between the slot centers of the slots 18 on both sides of the six consecutive teeth 17b. Here, the 6-slot angular interval corresponds to one magnetic pole pitch. d is the length of the short side of the conductor wire 19.

48 pieces of the winding bodies 22 configured in this way are arranged at a one-slot pitch in the circumferential direction, and the winding assembly 21 shown in FIG. 5 is assembled. In this winding assembly 21, eight first to fourth

linear portions

22a, 22b, 22c, and 22d arranged in one row in the radial direction are arranged in 48 rows in the circumferential direction at a one-slot pitch. Then, each of the eight first to fourth

linear portions

22a, 22b, 22c, and 22d arranged in one row in the radial direction is housed in each of the slots 18.

Then, the 48 iron core blocks 17 position each of the teeth 17b radially outward between the adjacent first to fourth

linear portions

22a, 22b, 22c, and 22d of the winding assembly 21. Are arranged at a substantially equiangular pitch in the circumferential direction. Next, the core blocks 17 arranged in the circumferential direction are moved inward in the radial direction, and the teeth 17b of the core block 17 are moved between adjacent first to fourth

linear portions

22a, 22b, 22c, 22d. insert.

Then, as shown in FIG. 3, the side surfaces in the circumferential direction of adjacent iron core blocks 17 are abutted with each other, and 48 iron core blocks 17 are attached to the winding assembly 21. Next, the iron core blocks 17 arranged in an annular shape are press-fitted and fixed into the frame 2 to be integrated, whereby the stator iron core 16 is manufactured. Further, the winding assembly 21 is connected to form the stator winding 20. As a result, the stator winding 20 is mounted on the stator core 16 and the stator 15 is assembled. In each slot 18, eight first to fourth

straight portions

22 a, 22 b, 22 c, 22 d are arranged in a row in the radial direction with the length direction of the long side of the rectangular cross section facing the circumferential direction. It is stored.

FIGS. 9 and 10 each show a state in which three winding bodies 22 are mounted on the stator core 16 sharing one slot 18, and FIG. 11 shows a winding mounted on the stator core 16. The state which looked at the wire 22 from the radial direction outer side is shown. Here, five slots 18 arranged at an angular interval of 6 slots in the circumferential direction are arranged in the circumferential order in the first slot 18 ₁ , the second slot 18 ₂ , the third slot 18 ₃ , the fourth slot 18 ₄ , The fifth slot is 18 ₅ .

Paying attention to the first winding body 22 (hereinafter referred to as the winding body 221), from the slot opening side of the _second slot 182, from the first linear portion 22a of the first layer to the other axial end side (first 1 the first coil end 22e which extend out to the coil end 20f side), the inclination angle extends in the first slot 18 ₁ side circumferentially theta, only lane change (shift distance d radially outwardly at the top portion Then, it extends to the first slot 18 ₁ side in the circumferential direction at a reverse inclination angle θ, and is connected to the second straight portion 22b of the second layer from the slot opening side of the _first slot 18 ₁ . Next, the second coil end portion 22f extending from the slot opening side of the _first slot 18 ₁ to the one end side in the axial direction (second coil end 20r side) from the second linear portion 22b of the second layer has an inclination angle θ Extends to the second slot 18 ₂ side in the circumferential direction, shifted by a distance d outward in the radial direction at the top, and then extended to the second slot 18 ₂ side in the circumferential direction at a reverse inclination angle θ. The third slot 18 ₂ is connected to the third straight portion 22c of the third layer from the slot opening side.

Next, the third coil end portion 22g extending from the slot opening side of the second slot 18 ₂ to the first coil end 20f side from the third linear portion 22c of the third layer is third in the circumferential direction at an inclination angle θ. of extending the slot 18 ₃ side, is shifted parietal distance radially outwards d, then the inclination angle of the opposite θ circumferentially extending in the third slot 18 ₃ side, the third slot 18 ₃ It is connected to the fourth linear portion 22d of the fourth layer from the slot opening side.

Subsequently, the connecting wire 23 extending from the fourth straight portion 22d of the fourth layer to the second coil end 20r side from the slot opening side of the _third slot 18 _{3 has} the second slot 18 in the circumferential direction at an inclination angle θ. _{The second} slot 18 ₂ extends to the second slot 18 and is shifted radially outward at the top by a distance d, and then extends circumferentially at the opposite inclination angle θ to the second slot 18 ₂ side. To the first straight portion 22a of the fifth layer. The first coil end portion 22e extending from the first straight portion 22a of the fifth layer to the first coil end 20f side from the slot opening side of the second slot 18 _{2 is} the first slot in the circumferential direction at an inclination angle θ. 18 ₁ side, is shifted by a distance d radially outward at the top of the head, and then extends to the first slot 18 ₁ side in the circumferential direction at a reverse inclination angle θ, and the slot opening of the _first slot 18 ₁ It is connected to the second straight portion 22b of the sixth layer from the side.

Next, the second coil end portion 22f extending from the second straight portion 22b of the sixth layer to the second coil end 20r side from the slot opening side of the _first slot 181 is second in the circumferential direction at an inclination angle θ. slot 18 extends in _two side, is shifted parietal distance radially outwards d, then the inclination angle of the opposite θ circumferentially extending into the second slot 18 ₂ side, of the second slot 18 ₂ The slot is connected to the third straight portion 22c of the seventh layer from the slot opening side. Then, the third coil end portion 22g extending from the slot opening side of the second slot 18 ₂ to the first coil end 20f side from the third linear portion 22c of the seventh layer is the third in the circumferential direction at the inclination angle θ. of extending the slot 18 ₃ side, is shifted parietal distance radially outwards d, then the inclination angle of the opposite θ circumferentially extending in the third slot 18 ₃ side, the third slot 18 ₃ The slot is connected to the fourth straight portion 22d of the eighth layer from the slot opening side.

Therefore, the second slot 18 of the first linear portion 22a of the _second first layer and the first slot 18 ₁ of the second layer second linear portion 22b is connected by the first coil end 22e, the first The second straight line portion 22b of the second layer of the slot 18 ₁ and the third straight line portion 22c of the third layer of the second slot 18 ₂ are connected by the second coil end portion 22f, and the second slot 18 _2. The third straight line portion 22c of the third layer and the fourth straight line portion 22d of the fourth layer of the _third slot 183 are connected by the third coil end portion 22g to form a δ-shaped coil pattern.

Further, the second slot 18 of the first linear portion 22a of the _second fifth layer and the first slot 18 ₁ of the sixth layer second linear portion 22b is connected by the first coil end 22e, the first The second straight portion 22b of the sixth layer of the slot 18 ₁ and the third straight portion 22c of the seventh layer of the second slot 18 ₂ are connected by the second coil end portion 22f, and the second slot 18 _2. The seventh straight line portion 22c of the seventh layer and the fourth straight line portion 22d of the eighth layer of the _third slot 183 are connected by the third coil end portion 22g to form a δ-shaped coil pattern. Then, the fourth straight portion 22d of the fourth layer of the _third slot 18 ₃ and the first straight portion 22a of the fifth layer of the second slot 18 ₂ are connected by the crossover 23.

Thus, the first winding body 221 is configured by connecting two δ-shaped coil patterns with the crossover wires 23 and arranging them in two layers in the radial direction. In the first to third

coil end portions

22e, 22f, 22g and the crossover wire 23, the inclined portions from the end portions of the first to fourth

straight portions

22a, 22b, 22c, 22d to the top of the head are viewed from the axial direction. It is formed in a substantially arc shape. That is, the first to third

coil end portions

22e, 22f, 22g and the inclined portion of the crossover wire 23 maintain the radial position.

Similarly, the second winding body 222 is mounted in the second slot 18 ₂ , the third slot 18 _3, and the fourth slot 18 ₄ , and the third winding body 223 is connected to the third slot 18. ₃ Mounted in the fourth slot 18 ₄ and the fifth slot 18 ₅ . Then, the slot 18 ₃ three

windings body

221, 222 and 223 are shared, the fourth straight section 22a from the 1, 22b, 22c, 22 d has a length direction of the long sides of the rectangular cross section of the conductor wire 19 8 are stored in a line in the radial direction, facing the circumferential direction.

In the stator winding 20 configured as described above, the first coil end portion 22e extending from the first linear portion 22a located on the first layer of the winding body 22 to the first coil end 20f side has a circumferential shape. One side in the circumferential direction passes above the first coil end portion 22e extending to the first coil end 20f side from the first linear portion 22a located in the first layer of the winding body 22 located next to the one side in the direction. Is shifted by a distance d outward in the radial direction at the top of the head, and extends to one side in the circumferential direction through the lower side of the first coil end portion 22e of the winding body 22 located next to one side in the circumferential direction. Connected to the second straight portion 22b.

The second coil end portion 22f extending from the second linear portion 22b of the winding body 22 to the second coil end 20r side is second to the second linear end portion 22b of the winding body 22 located next to one side in the circumferential direction. 2 extending to the other side in the circumferential direction through the lower side of the second coil end portion 22f extending to the coil end 20r side, appearing in the trouble of the top of the head, shifted by the distance d radially outward at the top of the head, It passes above the second coil end portion 22f of the winding body 22 located next to one side in the circumferential direction, extends to the other side in the circumferential direction, and is connected to the third linear portion 22c.

The third coil end portion 22g extending from the third straight portion 22c of the winding body 22 to the first coil end 20f side extends from the third straight portion 22c of the winding body 22 located adjacent to one side in the circumferential direction. It extends below the third coil end portion 22g that protrudes to one side in the circumferential direction, appears in front of the top of the head, shifts radially outward by a distance d at the top of the head, and next to one side in the circumferential direction. The winding body 22 is positioned so as to pass above the third coil end portion 22g and extend to one side in the circumferential direction, and is connected to the fourth linear portion 22d.

Thus, as shown in FIG. 12, in the first coil end 20f, a gap is formed between the inclined portions of the first coil end portion 22e adjacent in the circumferential direction and between the inclined portions of the third coil end portion 22g. Is done. In the second coil end 20r, a gap is formed between the inclined portions of the second coil end portion 22f and between the inclined portions of the crossover wire 23. These gaps constitute a flow path for the liquid refrigerant.

Rotating electric machine 100 configured in this manner operates as an 8-pole, 48-slot inner rotor type three-phase motor by supplying AC power to stator winding 20. The supply pump 34 is driven, and liquid refrigerant such as ATF oil and engine oil is supplied to the introduction flow path 30 through the supply pipe 33 and the supply hole 31. The liquid refrigerant supplied to the introduction flow path 30 is injected from the injection hole 32 to the first and second coil ends 20f and 20r. Whereas the air gap g between the rotor 6 and the stator 15 is about 1 mm, the circumferential gap l between the roots of the first coil end portion 22e is about 5 mm, so that the liquid refrigerant becomes an air gap. Difficult to flow in. Further, the circumferential clearance between the root portions of the second coil end portion 22f, the circumferential clearance between the root portions of the third coil end portion 22g, and the circumferential clearance between the root portions of the connecting wire 23 are also the first coil end. It is equivalent to the clearance of the circumferential clearance between the roots of the portion 22e. Therefore, the liquid refrigerant injected to the first and second coil ends 20f and 20r is used for cooling the first and second coil ends 20r without flowing into the air gap between the rotor 6 and the stator 15. It is made.

The liquid refrigerant injected from the radially outer side to the first coil end 20f is inclined at the third coil end portion 22g adjacent to the circumferential direction located at the outermost periphery, as shown by arrows in FIGS. The gap between the parts flows from the top to the root. Then, the liquid refrigerant flows radially inward on the end face of the stator core 16, and is sucked up between the root portions of the third coil end portions 22g adjacent in the radial direction by a capillary phenomenon. Next, as indicated by arrows in FIGS. 12 and 13, the gap between the inclined portions of the third coil end portion 22 g located on the inner diameter side of the inclined portion of the third coil end portion 22 g located on the outermost periphery is the top of the head. Flows to the side. Furthermore, it flows radially inward on the end face of the stator core 16, and is sucked up between the root portions of the first coil end portions 22e adjacent in the radial direction by capillary action. And the clearance gap between the inclination parts of the 1st coil end part 22e adjacent to the circumferential direction flows into the top part side.

As described above, the liquid refrigerant injected to the first coil end 20f is a gap between the inclined portions of the first coil end portion 22e adjacent in the circumferential direction, and the inclined portion of the third coil end portion 22g adjacent in the circumferential direction. It flows in the circumferential direction through the gap between them. Further, the liquid refrigerant flows radially inward along the end surface of the stator core 16. Accordingly, the liquid refrigerant flows in the radial direction and the circumferential direction of the first coil end 20f, flows into the first coil end 20f, and the first coil end 20f is effectively cooled.

Although not shown, the liquid refrigerant injected from the radially outer side to the second coil end 20r passes through the gap between the inclined portions of the second coil end portions 22f adjacent to the circumferential direction located on the outermost periphery. Flows from side to root. Then, the liquid refrigerant flows radially inward on the end face of the stator core 16, and is sucked up between the root portions of the second coil end portions 22f adjacent in the radial direction by capillary action. Next, a gap between the inclined portions of the second coil end portion 22f located on the inner diameter side of the inclined portion of the second coil end portion 22f located on the outermost periphery flows to the top portion side. Furthermore, it flows radially inward on the end face of the stator core 16 and is sucked up between the roots of the connecting wires 23 adjacent in the radial direction by capillary action. And the clearance gap between the inclination parts of the connecting wire 23 adjacent to the circumferential direction flows to the top part side.

Thus, the liquid refrigerant injected to the second coil end 20r is a gap between the inclined portions of the second coil end portion 22f adjacent in the circumferential direction, and a gap between the inclined portions of the connecting wire 23 adjacent in the circumferential direction. Flows in the circumferential direction. Further, the liquid refrigerant flows radially inward along the end surface of the stator core 16. Accordingly, the liquid refrigerant flows in the radial direction and the circumferential direction of the second coil end 20r, flows into the second coil end 20r, and the second coil end 20r is effectively cooled.

The liquid refrigerant that has cooled the first and second coil ends 20f, 20r is collected in the lower part of the frame 2, and is returned from the oil pan 36 to the supply pump 34 via the return pipe 35.

According to the first embodiment, the winding body 22 includes the conductor wire 19 in the order of the second slot 18 ₂ , the first slot 18 ₁ , the second slot 18 ₂ , the third slot 18 ₃ , and the first slot. A δ-shaped coil pattern formed by alternately changing the insertion direction from the axial direction into the 18 ₁ , the second slot 18 ₂ and the third slot 18 ₃ is repeatedly wound twice in the radial direction. Have been made.

Therefore, the bending radii at the tops of the first to third

coil end portions

22e, 22f and 22g and the crossover wire 23 are reduced, and the increase in size of the first and second coil ends 20f and 20r due to the lane change is suppressed. it can. In addition, the winding body 22 is a distributed winding, which suppresses torque pulsation and increases output.

Further, in the first coil end 20f, a refrigerant flow path formed by a gap between the first coil end portions 22e adjacent in the circumferential direction is adjacent to the flow path group in which the circumferential direction is arranged at one slot pitch in the circumferential direction. A refrigerant flow path formed by a gap between the matching third coil end portions 22g is mixed in the radial direction. As a result, the liquid refrigerant supplied to the first coil end 20f flows through the refrigerant flow path formed by the gap between the third coil end portions 22g to reach the end surface of the stator core 16, and the end surface of the stator core 16 It flows inward in the radial direction, and flows away from the end face of the stator core 16 through a coolant channel formed by a gap between the first coil end portions 22e. As a result, the liquid refrigerant flows inward in the radial direction while flowing through the first coil end 20f in the circumferential direction, and is supplied to the inside of the first coil end 20f, thereby improving the cooling performance of the first coil end 20f.

On the other hand, in the second coil end 20r, a refrigerant flow path formed by a gap between the second coil end portions 22f adjacent in the circumferential direction is adjacent to the flow path group in which the circumferential direction is arranged at one slot pitch in the circumferential direction. The refrigerant flow path formed by the gap between the connecting crossover wires 23 is mixed in the radial direction. Thereby, the liquid refrigerant supplied to the second coil end 20r flows through the refrigerant flow path formed by the gap between the second coil end portions 22f, reaches the end surface of the stator core 16, and the end surface of the stator core 16 It flows inward in the radial direction and flows away from the end surface of the stator core 16 through the refrigerant flow path formed by the gap between the connecting wires 23. As a result, the liquid refrigerant flows radially inward while flowing through the second coil end 20r in the circumferential direction, and is supplied to the inside of the second coil end 20r, thereby improving the cooling performance of the second coil end 20r.

The winding body 22 has a first slot 18 ₁ , a second slot 18 _2, and a third slot 18 ₃ in the first to fourth

straight portions

22 a, 22 b, 22 c, and 22 d in the second slot. 18 ₂ , 1st slot 18 ₁ , 2nd slot 18 ₂ , 3rd slot 18 ₃ in order of radial thickness d of first to fourth

linear portions

22a, 22b, 22c, 22d on one side in the radial direction Shifting sequentially. Thereby, the assembly property of the winding assembly 21 is improved.

In the first coil end 20f, the first and third coil end portions 22e extending in the circumferential direction from the first to fourth

linear portions

22a, 22b, 22c, and 22d accommodated in the slot 18 in a line. The 22g direction is repeated in the radial direction alternately in the same direction and in the opposite direction. Further, in the second coil end 20r, the second coil end portion 22f extending in the circumferential direction from the first to fourth

linear portions

22a, 22b, 22c, and 22d housed in a row in the slot 18 and the transition are provided. The direction of the line 23 is alternately repeated in the radial direction in the same direction and in the opposite direction.

Therefore, in the first coil end 20f, a refrigerant flow path formed by a gap between the first coil end portions 22e adjacent in the circumferential direction is adjacent to the flow path group in which the circumferential direction is arranged at a one-slot pitch in the circumferential direction. The refrigerant flow paths formed by the gaps between the matching third coil end portions 22g are alternately and repeatedly arranged in the radial direction. Then, a flow path group in which the flow path direction extends in the circumferential direction toward the outer side in the axial direction and a flow path group in which the flow path direction extends in the circumferential direction toward the outer side in the axial direction are alternately arranged in the radial direction. Are arranged repeatedly. As a result, the liquid refrigerant easily flows in the circumferential direction through the first coil end 20f, and the cooling performance of the first coil end 20f is further enhanced.

Further, in the second coil end 20r, a refrigerant flow path formed by a gap between the second coil end portions 22f adjacent in the circumferential direction is adjacent to the flow path group in which the circumferential direction is arranged at one slot pitch in the circumferential direction. The refrigerant flow paths formed by the gaps between the connecting crossover wires 23 are alternately and repeatedly arranged in the radial direction. Then, a flow path group in which the flow path direction extends in the circumferential direction toward the outer side in the axial direction and a flow path group in which the flow path direction extends in the circumferential direction toward the outer side in the axial direction are alternately arranged in the radial direction. Are arranged repeatedly. As a result, the liquid refrigerant easily flows in the circumferential direction through the second coil end 20r, and the cooling performance of the second coil end 20r is further enhanced.

In the first embodiment, the hole direction of the injection hole formed in the inner frame 2b is the radial direction, but the liquid refrigerant injection direction is the inclination of the inclined portions of the second coil end portion and the third coil end portion. You may make the hole direction of an injection hole incline with respect to radial direction so that a direction may be followed. As a result, the liquid refrigerant can easily flow into the first and second coil ends 20f, 20r, and the first and second coil ends 20f, 20r can be effectively cooled.

Embodiment 2. FIG.
FIG. 14 is an end view of the main part showing the first coil end of the stator applied to the rotating electrical machine according to Embodiment 2 of the present invention, and FIG. 15 is applied to the rotating electrical machine according to Embodiment 2 of the present invention. It is principal part sectional drawing which shows the surroundings of the 1st coil end of a stator.

14 and 15, the insulating sheet 40 as the partition member includes an inclined portion that extends from the first straight portion 22 a to the top of the first coil end portion 22 e and an inclined portion that extends from the second straight portion 22 b to the top of the head. And the gap between the inclined portion from the third straight end portion 22c of the third coil end portion 22g to the top of the head and the inclined portion from the fourth straight portion 22d to the top of the head, respectively. It is inserted over the circumference. Although not shown, the gap between the inclined portion from the second straight line portion 22b of the second coil end portion 22f to the top of the head and the inclined portion from the third straight line portion 22c to the top of the head, and the first of the crossover 23 It is inserted over the entire circumference in the circumferential direction between each of the gaps between the inclined portion extending from the three straight portions 22c to the top of the head and the inclined portion extending from the fourth straight portions 22d to the top of the head. The insulating sheet 40 is obtained by molding a sheet material made of glass cloth, polyether ether ketone, polyphenyl sulfide, polytetrafluoroethylene, or the like into a strip shape.
Other configurations are the same as those in the first embodiment.

Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

From FIG. 10, the first and third

coil end portions

22e and 22g extend from the second layer of the slot 18 and the second and third

straight portions

22b and 22c of the third layer in the same circumferential direction. I understand. Similarly, the first and third

coil end portions

22e and 22g extend from the fourth and fifth

straight portions

22d and 22a of the slot 18 in the same circumferential direction. Recognize. It can also be seen that the first and third

coil end portions

22e and 22g extend in the same circumferential direction from the sixth and seventh straight and second

straight portions

22b and 22c of the slot 18. . That is, at the first coil end 20f, the straight portions of the second layer and the third layer of the slot 18, the straight portions of the fourth layer and the fifth layer, and the straight portions of the sixth layer and the seventh layer are extended. The coil end portions having the same phase are arranged adjacent to each other in the radial direction, and the potential difference between the coil end portions is small.

10 that the first coil end portion 22e extends from the first and second

straight portions

22a and 22b of the slot 18 in the opposite direction of the circumferential direction. Further, it can be seen that the third coil end portion 22g extends from the third layer of the slot 18 and the third and fourth

straight portions

22c, 22d of the fourth layer in opposite directions in the circumferential direction. It can also be seen that the first coil end portion 22e extends from the fifth and sixth layer first and second

straight portions

22a and 22b of the slot 18 in the opposite direction of the circumferential direction. Further, it can be seen that the third coil end portion 22g extends from the seventh and eighth

straight portions

22c and 22d of the slot 18 in the opposite direction of the circumferential direction. That is, in the first coil end 20f, the straight portions of the first layer and the second layer of the slot 18, the straight portions of the third layer and the fourth layer, the straight portions of the fifth layer and the sixth layer, and the seventh layer and the first layer. The coil end portions of different phases extending from each of the eight straight portions intersect each other in the radial direction, and the potential difference between the coil end portions becomes large.

In the second embodiment, at the first coil end 20f, the insulating sheet 40 extends from the straight portions of the first and second layers of the slot 18 and the straight portions of the fifth and sixth layers. Of the third coil end portion 22g extending between the inclined portions of the first coil end portion 22e, the straight portions of the third layer and the fourth layer, and the straight portions of the seventh layer and the eighth layer of the slot 18. It is inserted between the inclined parts. Therefore, the withstand voltage between the coil end portions of different phases having a large potential difference can be increased.

From FIG. 10, on the second coil end 20r side, the second coil end portion 22f and the crossover wire 23 are arranged in the circumferential direction from the third and fourth

straight portions

22c and 22d of the third layer and the fourth layer of the slot 18. It can be seen that they extend in the same direction. Similarly, it can be seen that the second coil end portion 22f and the crossover wire 23 extend from the fifth and sixth layer first and second

straight portions

22a and 22b of the slot 18 in the same circumferential direction. . In other words, in the second coil end 20r, the coil end portions of the same phase extending from the third layer and fourth layer straight portions of the slot 18 and the fifth layer and sixth layer straight portions are radially arranged. Adjacent to each other, the potential difference between the coil end portions is small.

From FIG. 10, the second coil end portion 22f extends in the direction opposite to the circumferential direction from the second and third

straight portions

22b and 22c of the second layer and the third layer of the slot 18, and the crossover wire 23 is connected to the slot. The fourth coil end portion 22f extends in the direction opposite to the circumferential direction from the fourth and first

straight portions

22d and 22a of the eighteenth layer and the fifth layer, and the second coil end portion 22f includes the sixth and seventh layers of the slot 18. It can be seen that the second and third

straight portions

22b and 22c extend in the direction opposite to the circumferential direction. In other words, at the second coil end 20r, the straight portions of the second and third layers of the slot 18, the straight portions of the fourth and fifth layers, and the straight portions of the sixth and seventh layers are extended. The coil end portions of different phases intersect in the radial direction, and the potential difference between the coil end portions increases.

In the second embodiment, at the second coil end 20r, the insulating sheet 40 extends from the straight portions of the second and third layers of the slot 18 and the straight portions of the sixth and seventh layers. The second coil end portion 22f is inserted between the inclined portions, and between the inclined portions of the crossover wires 23 extending from the straight portions of the fourth layer and the fifth layer of the slot 18, respectively. Therefore, the withstand voltage between the coil end portions of different phases having a large potential difference can be increased.

Further, a pair of insulating sheets 40 is formed by a gap between the inclined portions of the first coil end portions 22e adjacent in the circumferential direction, and a gap between the inclined portions of the second coil end portions 22f adjacent in the circumferential direction. Formed by the gap between the inclined portions of the third coil end portions 22g adjacent in the circumferential direction, and the gap between the inclined portions of the connecting wires 23 adjacent in the circumferential direction. It arrange | positions at each radial direction both sides of a flow path. Thereby, the four sides of each flow path are closed, and a cooling refrigerant can be flowed effectively.

Embodiment 3 FIG.
FIG. 16 is a perspective view showing a stator applied to a rotary electric machine according to Embodiment 3 of the present invention.

In FIG. 16, the partition member 41 is formed in a band shape using an insulating material such as glass cloth, polyether ether ketone, polyphenyl sulfide, polytetrafluoroethylene, and the lower end is in contact with the end surface of the stator core 16. The first and second coil ends 20f and 20r of the stator winding 20 are arranged over the entire circumference on the inner circumference side.
Other configurations are the same as those in the first embodiment.

Therefore, also in the third embodiment, the same effect as in the first embodiment can be obtained.
According to the third embodiment, the partition wall member 41 is arranged on the inner circumference side of the first and second coil ends 20f, 20r of the stator winding 20 over the entire circumference. Therefore, the partition member 41 prevents the liquid refrigerant flowing in the first and second corends from the outer diameter side to the inner diameter side from flowing out from the first and second coil ends 20f and 20r to the inner diameter side. Outflow to the air gap between the stator 15 and the rotor 6 is prevented.

Embodiment 4 FIG.
FIG. 17 is a sectional view showing a rotary electric machine according to Embodiment 4 of the present invention.

In FIG. 17, the rotor 50 passes through an annular rotor core 51, a shaft 54 that is press-fitted and fixed so as to penetrate the axial center position of the rotor core 51, and an outer peripheral side of the rotor core 51. The first end plate 56 and the second end, which are press-fitted and fixed to the shaft 54 and arranged so as to be in contact with both end surfaces of the rotor core 51 in the axial direction. And a plate 59.

The rotor core 51 is manufactured by stacking and integrating annular core pieces punched from a thin magnetic steel sheet. Each of the magnet housing holes 52 has a rectangular shape in which the cross section perpendicular to the axial direction of the shaft 54 is constant in the axial direction, passes through the outer peripheral side of the rotor core 51 in the axial direction, and has eight equal pitches in the circumferential direction. Is formed. A coolant channel 53 is formed through the rotor core 51 in the axial direction so as to open to the inner diameter side of the magnet housing hole 52 and to the magnet housing hole 52. A permanent magnet 55 is housed in each of the magnet housing holes 52 and attached so as to penetrate the outer peripheral side of the rotor core 51.

The first end plate 56 is made of a ring-shaped flat plate having an outer diameter substantially equal to the outer diameter of the rotor core 51. The introduction flow path 57 is formed by recessing one surface of the first end plate 56 by a certain depth leaving the outer peripheral edge portion. The first discharge passages 58 pass through the first end plate 56 in the axial direction so as to connect the outer peripheral portion of the introduction flow channel 57 and the other surface side of the first end plate 56, respectively, and are equidistant in the circumferential direction. 8 are formed.

The first end plate 56 is press-fitted and fixed to the shaft 54 from one side in the axial direction with one surface directed to the rotor core 51 through the shaft 54 at the axial center position. One surface of the first end plate 56 is in contact with one end surface of the rotor core 51 in the axial direction, and the opening of the introduction channel 57 is closed. A coolant channel 53 formed in the rotor core 51 is connected to the introduction channel 57. The first discharge passages 58 are located radially outward of the introduction passages 57.

The second end plate 59 is made of a ring-shaped flat plate having an outer diameter substantially equal to the outer diameter of the rotor core 51. The discharge channel 60 is formed in a ring shape by being depressed by a certain depth on the outer peripheral side of one surface of the second end plate 59. Eight second discharge passages 61 penetrate the second end plate 59 in the axial direction so as to connect the discharge passage 60 and the other surface side of the second end plate 59, respectively, at equal pitches in the circumferential direction. Is formed.

The second end plate 59 is press-fitted and fixed to the shaft 54 from the other side in the axial direction with one surface thereof directed toward the rotor core 51 through the shaft 54 at the axial center position. One surface of the second end plate 59 is in contact with the other end surface of the rotor core 51 in the axial direction, and the opening of the discharge channel 60 is closed. An introduction channel 57 formed in the rotor core 51 is connected to the discharge channel 60. The second discharge passages 61 are located radially outward of the introduction passages 57.

The shaft 54 is branched in the radial direction from the in-axis flow path 62 and the in-axis flow path 62 formed to reach the axial center position from one end in the axial direction to a position directly below the first end plate 56, respectively. A branch channel 63 that connects the in-axis channel 62 and the introduction channel 57 formed in the first end plate 56.

The supply pipe 33 connects the discharge port of the supply pump 34 and the in-shaft flow path 62, and the return pipe 35 connects the oil pan 36 attached below the frame 2 and the suction port of the supply pump 34, cooling The mechanism is configured.

In the rotating electrical machine 100A configured as described above, the supply pump 34 is driven, and the liquid refrigerant is supplied to the introduction flow path 57 via the supply pipe 33, the in-axis flow path 62, and the branch flow path 63. A part of the liquid refrigerant supplied to the introduction flow path 57 is supplied to the refrigerant flow path 53 and used for cooling the permanent magnet 55. The remaining portion of the liquid refrigerant supplied to the introduction flow path 57 is discharged from the first discharge path 58. At this time, the liquid refrigerant is bent in the centrifugal direction by the rotation of the rotor 50 and is injected to the inner peripheral surface of the first coil end 20 f of the stator winding 20. On the other hand, the liquid refrigerant used for cooling the permanent magnet 55 flows into the discharge passage 60 and is discharged from the second discharge passage 61. At this time, the liquid refrigerant is bent in the centrifugal direction by the rotation of the rotor 50 and is injected onto the inner peripheral surface of the second coil end 20 r of the stator winding 20.

The liquid refrigerant jetted from the radially inner side to the first coil end 20f has a gap between the inclined portions of the first coil end portions 22e adjacent to the circumferential direction located on the innermost circumference from the top to the root side. Flowing. Then, the liquid refrigerant flows inward and outward in the radial direction on the end face of the stator core 16, and is sucked up between the root portions of the first coil end portions 22e adjacent in the radial direction by capillary action. Next, a gap between the inclined portions of the first coil end portion 22e located on the outer diameter side of the inclined portion of the first coil end portion 22e located on the innermost circumference flows toward the top of the head. Further, it flows radially outward on the end face of the stator core 16, and is sucked up between the root portions of the third coil end portions 22g adjacent in the radial direction by capillary action. And the clearance gap between the inclination parts of the 3rd coil end part 22g adjacent to the circumferential direction flows to the top part side.

As described above, the liquid refrigerant injected to the first coil end 20f is a gap between the inclined portions of the first coil end portion 22e adjacent in the circumferential direction, and the inclined portion of the third coil end portion 22g adjacent in the circumferential direction. It flows in the circumferential direction through the gap between them. Further, the liquid refrigerant flows radially outward along the end face of the stator core 16. Accordingly, the liquid refrigerant flows in the radial direction and the circumferential direction of the first coil end 20f, flows into the first coil end 20f, and the first coil end 20f is effectively cooled.

In addition, the liquid refrigerant injected from the radially inner side to the second coil end 20r has a gap between the inclined portions of the second coil end portions 22f adjacent to the circumferential direction located at the innermost periphery, and is fundamentally formed from the top side. Flows to the side. Then, the liquid refrigerant flows radially outward on the end face of the stator core 16, and is sucked up between the root portions of the second coil end portions 22f adjacent in the radial direction by capillary action. Next, a gap between the inclined portions of the second coil end portion 22f located on the outer diameter side of the inclined portion of the second coil end portion 22f located on the innermost circumference flows toward the top of the head. Furthermore, it flows radially outward on the end face of the stator core 16 and is sucked up between the root portions of the connecting wires 23 adjacent in the radial direction by capillary action. And the clearance gap between the inclination parts of the connecting wire 23 adjacent to the circumferential direction flows to the top part side.

Thus, the liquid refrigerant injected to the second coil end 20r is a gap between the inclined portions of the second coil end portion 22f adjacent in the circumferential direction, and a gap between the inclined portions of the connecting wire 23 adjacent in the circumferential direction. Flows in the circumferential direction. Further, the liquid refrigerant flows radially outward along the end face of the stator core 16. Accordingly, the liquid refrigerant flows in the radial direction and the circumferential direction of the second coil end 20r, flows into the second coil end 20r, and the second coil end 20r is effectively cooled.

Therefore, also in the fourth embodiment, the same effect as in the first embodiment can be obtained.
According to the fourth embodiment, the liquid refrigerant is supplied from the first and

second discharge passages

58 and 61 formed in the first and

second end plates

56 and 59 disposed at both axial ends of the rotor core 51. The first and second coil ends 20f and 20r are sprayed on the inner peripheral surfaces. Therefore, when the rotor 50 rotates, the liquid refrigerant is injected to the inner peripheral surfaces of the first and second coil ends 20f and 20r, so that the liquid refrigerant is uniformly supplied to the first and second coil ends 20f and 20r. Thus, the first and second coil ends 20f and 20r can be effectively cooled evenly.

In each of the above embodiments, the winding body is made of a conductor wire having a rectangular cross section. However, the cross-sectional shape of the conductor wire constituting the winding body is not limited to a rectangle, for example, a circular cross section The conductor wire may be used.
In each of the above embodiments, the first to fourth straight portions are arranged in a row in the radial direction in the slot with the length direction of the long side of the rectangular cross section facing the circumferential direction. The first to fourth straight portions may be arranged in a row in the radial direction in the slot with the length direction of the short side of the rectangular cross section oriented in the circumferential direction.

In each of the above embodiments, an 8-pole 48-slot rotary electric machine has been described, but it goes without saying that the number of poles and the number of slots are not limited to 8 poles and 48 slots. Further, the number of slots is assumed to be formed at a rate of 2 per phase per pole, but the number of slots per phase per pole is not limited to 2, and may be 1 or 3 or more.

Further, in each of the above embodiments, the number of slots is formed at a ratio of 2 per pole per phase, and the interval between the first straight line portion and the second straight line portion of the winding body is set to a 6-slot angle interval, and the stator winding Although the wire is configured as a full-pitch winding, the interval between the first linear portion and the second linear portion of the winding body is not limited to the 6-slot angular interval. For example, the interval between the first straight portion and the second straight portion of the winding body may be set to a 5-slot angular interval, and the stator winding may be configured to have a short-pitch winding.

In each of the above embodiments, the winding body is formed by winding a conductor wire so that the δ-shaped coil pattern is repeated twice in the radial direction. However, the winding body has a diameter of the δ-shaped coil pattern. The number of times the direction is repeated is not limited to two, and may be one or three or more.

Further, in each of the above embodiments, the liquid refrigerant is injected from the radial direction to the first and second coil ends of the stator winding, but the liquid refrigerant is the first and second coil ends of the stator winding. It may be injected from the outside in the axial direction.

Claims

A housing;
A rotor fixed to a shaft rotatably supported by the housing and disposed in the housing;
An annular stator core having slots arranged in the circumferential direction, and a stator winding mounted on the stator core, with an air gap between the rotor and the rotor on the outer peripheral side of the rotor A stator held in the housing,
A cooling mechanism for cooling the stator winding by supplying a liquid refrigerant to the coil end of the stator winding,
Each of the stator windings is formed by winding a continuous conductor wire that is insulated and has no connection portion, and is arranged at n-slot angular intervals (where n is a natural number of 2 or more) in the circumferential direction. A plurality of winding bodies mounted in one slot, the second slot and the third slot and arranged at a pitch of one slot in the circumferential direction;
In the winding body, the conductor wire is connected to the second slot, the first slot, the second slot, and the third slot in this order, and to the first slot, the second slot, and the third slot. A δ-shaped coil pattern formed by alternately changing the insertion direction from the axial direction is repeatedly wound in the radial direction m times (where m is a natural number of 1 or more). A plurality of linear portions inserted into each of the slot, the second slot and the third slot are connected together by a coil end portion;
The coil end is constituted by the coil end portion,
The rotating electrical machine, wherein the liquid refrigerant supplied to the coil end flows through a gap between the coil end portions adjacent in the circumferential direction.
The winding body has a storage position in the radial direction in the first slot, the second slot, and the third slot of the linear portion, the second slot, the first slot, the second slot, the second slot The rotating electrical machine according to claim 1, wherein the rotating electrical machine is sequentially shifted to one side in the radial direction by the radial thickness of the linear portion in the order of three slots.
The straight portions are arranged in one row in each of the slots and are accommodated in a 4 ram layer,
The coil end portion housed in the slot and extending in the circumferential direction from the linear portion adjacent in the radial direction is alternately repeated in the radial direction in the same direction and in the opposite direction. The rotating electrical machine according to claim 2.
The strip-shaped partition member is arrange | positioned over the perimeter of the circumferential direction between the said coil end parts of a different phase of the said coil end, The Claim 1 characterized by the above-mentioned. Rotating electric machine.
The rotating electrical machine according to any one of claims 1 to 4, wherein a gap between base portions of the coil end portions adjacent to each other in a circumferential direction is larger than the air gap.
The band-shaped partition member is disposed on the inner peripheral side of the coil end over the entire circumference in contact with the coil end, according to any one of claims 1 to 5. The rotating electrical machine described.
The rotating electrical machine according to any one of claims 1 to 6, wherein the cooling mechanism is configured to inject the liquid refrigerant into the coil end from the outside in the radial direction.
The rotating electrical machine according to claim 7, wherein the liquid refrigerant is injected to the coil end along an inclination direction of the coil end portion located at the outermost diameter.
The rotating electrical machine according to any one of claims 1 to 5, wherein the cooling mechanism is configured to inject the liquid refrigerant into the coil end from the inside in the radial direction.